railway RRB JE (CBT I + CBT II) Mock Test 2024 Draftsman Floor and Roof Types of Floors

एस्फाल्ट फर्श की मोटाई होती है।

1
10-15 मिमी
2
20-30 मिमी
3
30 – 40 मिमी
4
85 मिमी
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